A Unity based tool that allows for automation and ease-of-use when creating Shirt mods. Please refer to the Shirt Creation Guide linked below for more details.
https://docs.google.com/document/d/1e1bSfNIATmEMym1isH2gFypWnL-PQHfrRzEOgiovvqM/edit?usp=sharing
Please report any bugs or problems in the issues section of the GitHub. Thanks!